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Mixture preparation system, electronic inj.,Gas > < Assembly overview

Golf Mk4

Checking fuel tank breather
Checking fuel tank breather
Special tools and workshop equipment required
   
t  Vacuum tester -V.A.G 1368-
  W00-0567
t  Hand vacuum pump -VAS 6213-
Test procedure
–  Remove fuel filler cap from filler neck.
–  Detach line -1- from activated charcoal filter and connect to vacuum tester -V.A.G 1368- connection -A-.
  W00-10259
–  Connect hand vacuum pump -VAS 6213- to vacuum tester -V.A.G 1368- -connection B-.
–  Set vacuum tester -V.A.G 1368- valve to -A/B- position.
–  Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.
If vacuum builds up:
–  Check gravity valve:
Front-wheel drive vehicles → Item
Four-wheel drive vehicles → Item
  N20-0330
–  Check line -1- from activated charcoal filter to fuel tank for blockage.
If vacuum does not build up:
–  Refit fuel filler cap.
–  Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.
  Note
If the fuel level in the tank is low the hand vacuum must be operated at least 20...30 times.
If vacuum builds up:
–  Renew fuel tank cap.
  N20-0330

Mixture preparation system, electronic inj.,Gas > < Assembly overview